CompTIA Network+ Practice Questions: Networking Concepts

8 free, exam-style CompTIA Network+ (N10-009) practice questions covering Networking Concepts. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.

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Q1. Which protocol operates at layer 4 of the OSI model and provides connection-oriented communication?

Explanation: TCP (Transmission Control Protocol) ensures reliable, ordered delivery of data between applications over networks. It establishes connections using a handshake process and operates at Layer 4 (Transport Layer) of the OSI model. Learn more.

Q2. Which of the following protocols is connectionless and operates at the Transport layer of the OSI model?

Explanation: UDP (User Datagram Protocol) is a connectionless protocol that operates at Layer 4 (Transport). It provides fast, low-overhead data delivery but does not guarantee reliability or order of packets, making it suitable for applications like DNS, DHCP, and streaming. Learn more.

Q3. Which of the following describes a MAN (Metropolitan Area Network)?

Explanation: A MAN typically covers a larger geographic area than a LAN (Local Area Network) but smaller than a WAN (Wide Area Network), often interconnecting multiple LANs within a city or metropolitan region. Learn more.

Q4. Which of the following is a characteristic of CSMA/CD used in older Ethernet networks?

Explanation: CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is an access method where devices listen to the network medium. If it's clear, they transmit. If a collision occurs (two devices transmit simultaneously), they stop, wait a random time, and try again. It was used in half-duplex Ethernet hubs. Learn more.

Q5. Which layer of the OSI model is responsible for logical addressing and path determination (routing)?

Explanation: Layer 3, the Network layer, is responsible for providing logical addressing (e.g., IP addresses) and determining the best path for data packets to travel from a source to a destination across one or more networks (routing). Learn more.

Q6. At which layer of the OSI model is data encryption and compression primarily handled to ensure application data is presented in a usable format?

Explanation: The Presentation Layer (Layer 6) is responsible for data formatting, including character encoding, compression, and encryption/decryption, ensuring that data sent by the application layer of one system can be understood by the application layer of another system. Learn more.

Q7. What is the primary advantage of using Classless Inter-Domain Routing (CIDR) notation (e.g., 192.168.1.0/24) for IP addressing?

Explanation: CIDR allows network administrators to define subnets of variable sizes, leading to more efficient use of IP address space. It also enables route summarization (aggregation) to reduce the size of routing tables. Learn more.

Q8. What is the scope of an IPv6 unique local address (ULA) (FC00::/7)?

Explanation: Unique Local Addresses (ULAs) are analogous to IPv4 private addresses. They are intended for local communications within a site or between a limited number of sites and are not meant to be routed on the global internet. Learn more.

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